I have been using RSP since the day it was announced as well, and really like it a lot.
I wasn't really convinced by the colors of RSE compared to NC for my d2x, and RSP probably still isn't as good as NC 4.3.2, but the gap is now small enough that I use RSP for all but the most critical images.
I am especially fond of the workflow, good (but not great) performance, detail extraction, curve and vibrance functions.
Regards,
Bernard